Lifting device for suspension bridge saddle

Abstract

The present application specifically relates to a lifting device for lifting the saddle of a suspension bridge, and specifically discloses a lifting device for the saddle of a suspension bridge, which includes a gantry installed on the top of the main tower, a saddle introduction port is reserved on the front side of the gantry, slide rails are arranged in parallel on the top of the left and right sides of the gantry, and a traction system is introduced at the end of the gantry, and the traction system is a winch; a sliding platform is installed on the slide rail, the sliding platform is slidably connected to the slide rail, a load-bearing shaft is fixed on the front side of the sliding platform, a rotatable drum is arranged outside the load-bearing shaft, and the cable of the traction system is wound on the drum; a cavity is arranged inside the load-bearing shaft, and a control component is installed in the cavity, and the control component can be used to switch between the positioning state of the sliding platform and the positioning state of the drum. During the process of lifting the saddle, the movement of the saddle in the vertical and horizontal directions is driven by the same traction system; while in the existing lifting equipment, the lateral and vertical movements need to adopt independent driving mechanisms, so the lifting equipment of this scheme is more streamlined in structure and more convenient in installation.

Description

Technical Field

[0001] The invention relates to the technical field of hoisting construction for suspension bridges, and in particular to hoisting equipment used for lifting a cable saddle of a suspension bridge. Background Art

[0002] The cable saddle is an important load-bearing component of the suspension bridge. The cable saddle includes the main cable saddle and the loose cable saddle. The main cable saddle is installed on the top of the main tower to bear and disperse the pressure of the main cable. The largest component of the main cable saddle usually reaches the level of hundreds of tons, and heavy lifting equipment needs to be installed on the top of the tower to lift the cable saddle component; the lifting equipment usually includes a gantry with a lattice structure installed on the top of the tower, and a lifting and transporting truss with a hoist as the main body is set on the top of the gantry structure. The top of the gantry is cantilevered toward the middle span side of the suspension bridge to the outside of the main tower to form a lifting position, and a slide rail is provided on the top of the gantry. The lifting and transporting truss is slidably connected to the slide rail, and the lifting and transporting truss can be driven to slide on the slide rail by a hand winch.

[0003] The hoisting and transporting gantry moves to the lifting position, and the winch is started to lower the sling to lift the saddle assembly from the bottom of the main tower; after the saddle assembly reaches the top of the main tower, the hand winch pulls the hoisting and transporting gantry to move horizontally on the slide rail, and the saddle assembly can be moved to the installation position. That is, the vertical lifting of the saddle and the horizontal movement of the saddle after the saddle is lifted to the top of the tower are independently controlled and use independent power sources. With the rise of automated control, based on its higher efficiency and safety characteristics, the use of automated control for saddle lifting has also become one of the trends. If automatic control in the horizontal direction is to be achieved, it is necessary to add controllable horizontal movement drive equipment. Since these devices need to be lifted to the top of the tower for installation, the independent power sources in the vertical and horizontal directions increase the difficulty and cost of automated control.

[0004] In addition to being an important part of the lifting saddle, the gantry is also an important part of the construction of temporary facilities such as catwalks, traction systems, and cable tensioning systems. For example, the gantry load-bearing cable is based on the gantry. The gantry load-bearing cable is located above the catwalk. During the main cable strand erection stage, the gantry load-bearing cable is integrated with the catwalk through the catwalk gantry and serves as the supporting cable of the gantry traction system; after the main cable is erected, it serves as the load-bearing cable of the cable trolley, used for moving the cable tightening machine, transporting cable clamps, slings, and winding wire cable drums.

[0005] In the prior art, the installation of the gantry load-bearing cable is usually carried out by using a traction system, and then the sag of the catwalk gantry load-bearing cable is adjusted by using a tower top winch; secondly, after the traction of the main cable strand is completed, the tower top winch is required to lift the cable strand to put it into the saddle. Since the installation of the lifting and transporting truss for lifting the cable saddle at the top of the gantry has different requirements for the gantry structure than the installation of the tower top winch and the gantry load-bearing cable, after the cable saddle is lifted, the catwalk installation stage begins, and the original lifting and transporting truss needs to be dismantled, the gantry needs to be modified, and then the gantry load-bearing cable needs to be installed, which will also reduce the construction efficiency. Summary of the invention

[0006] The object of the present invention is to provide a lifting device for a suspension bridge saddle which has lower installation difficulty and is convenient for automatic control of the lifting of the saddle.

[0007] The lifting device of the cable saddle of the suspension bridge includes a gantry installed on the top of the main tower. The gantry adopts a truss structure. The gantry is provided with a saddle introduction port toward the middle span side (i.e., the front side of the gantry). Parallel slide rails are set on the top of the left and right sides of the gantry along the direction of the bridge. The traction system is installed toward the side span side (i.e., the end of the gantry). The traction system is a winch.

[0008] A sliding platform is installed on the slide rail, and the sliding platform is slidably connected to the slide rail. A load-bearing shaft is fixed on the front side of the sliding platform, and a rotatable drum is arranged outside the load-bearing shaft. The cable of the traction system is wound around the drum.

[0009] A cavity is provided in the bearing shaft, in which a control assembly is installed, a plurality of first positioning holes are provided on the side wall of the slide rail, and a plurality of second positioning holes are evenly distributed on the inner wall of the rotating drum along the circumferential direction; the control assembly includes a first positioning rod that can slide along the axial direction of the cavity, and the first positioning rod enters the first positioning hole to position the sliding platform; the control assembly also includes a positioning column that penetrates the side wall of the bearing shaft and can slide radially along the bearing shaft, and the positioning column enters the second positioning hole to position the rotating drum;

[0010] A tension spring I is sleeved on the first positioning rod so that the first positioning rod is subjected to a force that pushes it toward the first positioning hole. A piston I is provided at the end of the first positioning rod that is away from the first positioning hole. The two sides of the piston I are respectively the first oil chamber where the first positioning rod is located and the second oil chamber where the positioning column is located. When the first oil chamber is pressurized, the piston I moves toward the second oil chamber, the first positioning rod is disengaged from the first positioning hole, and the second oil chamber pushes the positioning column into the second positioning hole, thereby switching the positioning state of the sliding platform to the rotating drum positioning state. A tension spring II is provided below the positioning column so that the positioning column is subjected to a force that pulls it away from the second positioning hole. When the pressure of the first oil chamber is relieved, the tension spring I pushes the first positioning rod toward the first positioning hole, the pressure of the second oil chamber is reduced, and the tension spring II pulls the positioning column out of the second positioning hole, thereby switching the rotating drum positioning state to the sliding platform positioning state.

[0011] The beneficial effects of this solution are:

[0012] First, the lifting device of the cable saddle of the suspension bridge is optimized. In the process of lifting the cable saddle, the vertical movement and horizontal movement of the cable saddle are driven by the same traction system (such as a hoist); in the existing lifting equipment, the lateral movement and vertical movement need to adopt independent driving mechanisms. Therefore, the lifting equipment of this scheme is more streamlined in structure and more convenient in installation. The specific lifting process is that the sliding platform is positioned at the front end of the gantry through the cooperation of the first positioning rod and the first positioning hole. At this time, the drum is in a rotatable state. After the cable saddle is hung, the traction system reels the cable, and the friction between the cable and the drum causes the drum to rotate, so that the cable saddle can be lifted; when the cable saddle is lifted to a certain height, the first oil chamber is pressurized, and the pressure in the second oil chamber will also increase. In conjunction with the rotation of the drum, when the positioning column is opposite to the second positioning hole, the positioning column will enter the second positioning hole, and the drum will no longer be able to rotate. At this time, the first positioning rod will also be separated from the first positioning hole, and the traction force of the traction system will be converted into pulling the sliding platform to slide, realizing lateral movement. That is, the large power system of this solution only requires one set of winches. The control component is an extremely weak power device compared to the winch. The two are linked to achieve weak control of strong. By using fewer large devices and more small devices, the installability of the lifting device is increased; while the lateral movement and vertical movement drive systems are independent of each other, which increases the difficulty of installation.

[0013] Secondly, the lifting equipment of this scheme has more advantages in the extension of controllability. The control component set in the cavity of the load-bearing shaft only plays a control role in switching the state, so it does not require excessive driving force and large power equipment; secondly, due to the incompressibility of hydraulic oil, the positioning state of the sliding platform and the positioning state of the drum are in a mutually restrained state, that is, when the sliding platform is in the positioning state, the drum will be in a rotatable state, and when the drum is in the positioning state, the sliding platform is in a sliding state; therefore, after the traction system is started, the state can be switched only by the control component. In the original lifting equipment, vertical movement and lateral movement are driven by different devices and need to be controlled independently, and the factors affecting its controllability have increased. In this scheme, the state can be switched through a single control, and the factors affecting its controllability are greatly reduced. With the development of intelligent control, automatic control is an inevitable trend of development. Since the lifting weight of the saddle is extremely large, its safety consideration must be placed in the first place. If there are many factors affecting its controllability when introducing automatic control, its safety risk will increase. Therefore, by reducing the factors affecting controllability, more favorable conditions are provided for the introduction of automatic control.

[0014] Third, during the catwalk erection stage, the gantry load-bearing rope is connected to the cable of the traction system introduced on the gantry on both sides, and the verticality of the gantry load-bearing rope can be directly adjusted through it. Compared with the lifting and transporting truss car that is connected to the top of the gantry through the sliding rail in the prior art, the sliding platform in this scheme can be switched to the sliding platform positioning state, and the sliding platform is equivalent to being fixed on the gantry, thereby providing conditions for the installation of the gantry load-bearing rope; in the process of lifting the rope strand into the saddle, the traction system can be used to lift and straighten the rope strand, thereby facilitating the rope strand to enter the saddle; in the above two cases, the rotating drum is in a rotating state relative to the sliding platform, and the gantry load-bearing rope plays a role equivalent to a pulley when it passes around the rotating drum. That is, through this scheme, the saddle lifting device is improved, so that after entering the catwalk construction stage, the construction of the gantry load-bearing rope, verticality adjustment and rope strand lifting into the saddle can be carried out without dismantling the original lifting and transporting truss car and modifying the gantry.

[0015] Preferred solution 1: As a further optimization of the basic solution, the slide rail is in a state of inclination with a higher end, and the inclination angle is 5-8°. A traction system is set at the end of the gantry, which can switch the saddle in three directions: rising, falling, and moving backward; when the track is in a horizontal state, the sliding platform needs to move forward, and a driving structure needs to be set; and by setting the slide rail at an angle, the sliding platform can be moved by its own gravity.

[0016] Preferred solution two: As a further optimization of preferred solution one, a buffer chamber is provided on the side of the second oil chamber away from the first oil chamber, a piston II and a compression spring abutting against piston II are provided in the buffer chamber, a positioning screw is provided in the second oil chamber, and the compression spring presses piston II toward the positioning screw; a positioning seat is provided below the positioning column, the positioning seat is threadedly connected to the side wall of the load-bearing shaft, a positioning surface is provided on the positioning seat, and the positioning surface forms a stepped surface with the outer side surface of the positioning column; piston I contacts the outer side surface of the positioning column, the first positioning rod is still matched with the first positioning hole, piston I contacts the positioning surface of the positioning seat, and the first positioning rod is disengaged from the first positioning hole.

[0017] Since hydraulic oil is incompressible, by setting a buffer chamber, during the change from the first positioning rod and the first positioning hole being in full cooperation to the piston I contacting the outer side of the positioning column, the first positioning rod and the first positioning hole are still in cooperation, and during this process, when the positioning column and the second positioning hole are not yet aligned, the buffer chamber provides conditions for the piston I to move to the outer side of the positioning column; if the piston I continues to move forward, the positioning column needs to be aligned with the second positioning hole, and the positioning column enters the second positioning hole, and the piston I can contact the positioning surface of the positioning seat. That is, by controlling the piston I to move in stages, the impact force on the positioning surface of the piston and the positioning seat can be reduced. On the contrary, when the pressure of the first oil chamber is removed, the positioning column and the second positioning hole are still in cooperation; after the first positioning hole is aligned with the first positioning column, the first positioning column enters the first positioning hole, and the positioning column can be separated from the second positioning hole.

[0018] Since there is a risk of hydraulic oil leakage, once the hydraulic oil in the second oil chamber leaks, the rotating drum and the sliding platform may be in an unlocked state, which poses a safety risk; in this solution, the piston I cooperates with the outer side of the positioning column and the positioning surface of the positioning seat to ensure that the positioning state of the sliding platform and the positioning state of the rotating drum are in a mutually restrained state.

[0019] Preferred solution three: As a further optimization of preferred solution two, the buffer chamber is maintained at a normal pressure state, so as to facilitate the reset of the piston II in the buffer chamber.

[0020] Preferred solution 4: As a further optimization of preferred solution 3, the winch is fixedly installed at the end of the top of the gantry facing the side span. During the catwalk construction stage, most of the construction needs to be carried out on the top of the tower, and the adjustment of cables and lifting require the coordination of the tower top winch, such as the adjustment of the sag of the catwalk gantry load-bearing cable mentioned in the background technology; therefore, it is necessary to install a winch on the top of the main tower, and in this preferred solution, the winch fixed at the end of the tower top gantry (the end of the gantry top facing the side span) can be used as a tower top winch after the lifting and installation of the cable saddle is completed.

[0021] Preferred solution five: As a further optimization of preferred solution three, the traction system includes a first winch fixed at the end of the top of the gantry facing the side span side and a second winch fixedly installed at the bottom of the main tower. The first winch and the second winch are connected in series to jointly provide driving force.

[0022] In the preferred scheme 5, the main function of the winch constituting the traction system is to complete the lifting of the saddle. The saddle is the largest lifting weight in the whole process. Since the lifting weight of the saddle reaches hundreds of tons, the traditional lifting and transporting gantry usually adopts a heavy winch, and the heavy winch also has the problem of heavy weight and difficult transportation. Therefore, the installation of the heavy winch to the top of the main tower is also completed by disassembling it at the bottom of the tower and then assembling it at the top of the tower, resulting in low efficiency. The winch of this scheme is not directly installed on the sliding platform, which provides multiple possibilities for the installation of the winch of the saddle lifting device, such as the winch can be fixed on the main tower, fixed on the gantry, or even fixed at the bottom of the main tower. However, in view of the necessity of installing a tower top winch on the top of the main tower, this scheme adopts a plurality of winches connected in series to form a traction system, one of which is installed at the end of the gantry and the other is installed at the bottom of the main tower. By using two winches to form a traction system, the lifting level of the selected winch can be reduced, and its weight is also reduced accordingly, so the difficulty of lifting it to the main tower is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the lifting equipment;

[0024] Figure 2 A transverse cross-sectional view of the sliding rail and the slider in sliding cooperation;

[0025] Figure 3 A longitudinal cross-sectional view of the sliding rail and the slider in sliding cooperation;

[0026] Figure 4 It is a state diagram of the sliding platform in the lifting state;

[0027] Figure 5 for Figure 4 A magnified view of part A;

[0028] Figure 6 for Figure 4 A magnified view of part B;

[0029] Figure 7 It is a state diagram of the sliding platform during the switching process from the lifting state to the lateral movement state;

[0030] Figure 8 This is the state diagram of the sliding platform in the lateral state.

[0031] The figure marks in the drawings of the specification include: door frame 21, traction system 22, sliding platform 23, slide rail 24, roller 241, first positioning rod 31, first positioning hole 311, piston I32, positioning column 33, second positioning hole 331, positioning seat 34, sealing cover 35, piston II36, buffer chamber 37, second oil chamber 38, first oil chamber 39, positioning screw 41, second positioning stud 42, oil inlet nozzle 43, collar 44, mounting plate 231, load-bearing shaft 232, rotating drum 233, tension spring I391, tension spring II341. DETAILED DESCRIPTION

[0032] The following is further described in detail through specific implementation methods:

[0033] Embodiment 1:

[0034] As attached Figure 1-8 As shown, it includes a gantry 21 installed on the top of the main tower. The gantry 21 adopts a truss structure. A saddle inlet is reserved on the gantry 21 facing the middle span. Slide rails 24 are arranged in parallel on the left and right sides of the top of the gantry 21 along the direction of the bridge. A traction system 22 is installed on the top of the gantry 21 facing the side span. The traction system 22 in this embodiment is a winch. The slide rail 24 is inclined at an angle of 8°. The end at the saddle inlet is the lower end. The slide rail 24 is slidably connected to the slide platform 23. As shown in the attached figure Figure 2 , 3As shown, sliders are fixed at both ends of the sliding platform 23, and the sliding platform 23 forms a sliding fit with the slide rail 24 through the sliders, and a plurality of rollers 241 are provided between the sliders and the slide rail 24, and a plurality of semicircular grooves are provided on the bottom surface of the slider, and the rollers 241 are embedded in the semicircular grooves; therefore, in the case of being not disturbed by other external forces, the sliding platform 23 will slide toward one end of the saddle inlet under its own gravity.

[0035] Two mounting plates 231 are welded to the bottom surface of the sliding platform 23, and both ends of the load-bearing shaft 232 pass through the mounting plates 231 and are welded to the mounting plates 231, so that the load-bearing shaft 232 and the sliding platform 23 are in a fixed state; the load-bearing shaft 232 is located between the opposite side walls of the two sides of the slide rails 24, and the end face of the load-bearing shaft 232 is in contact with the side of the slide rail 24 or there is a very small gap, so that the load-bearing shaft 232 can slide relative to the slide rail 24. A rotatable drum 233 is disposed outside the bearing shaft 232, and the cable of the traction system 22 is wound around the drum 233. When the sliding platform 23 is fixed on the slide rail 24, the friction between the cable and the drum 233 drives the drum 233 to rotate, so that the saddle can be lifted; and when the drum 233 is fixed to the bearing shaft 232, and the sliding platform 23 and the slide rail 24 are in a sliding state, the traction system 22 can drive the sliding platform 23 to slide on the slide rail 24 through the friction between the cable and the drum 233. Here, the state in which the cable can be raised and lowered when the drum 233 rotates is defined as the lifting state, and the state in which the sliding platform 23 moves laterally is positioned as the transverse movement state. In order to realize the switching between the lifting state and the transverse movement state, the control component is introduced below.

[0036] As attached Figure 4 , 8 As shown, the bearing shaft 232 has a cavity inside, in which a control assembly is installed. The side wall of the slide rail 24 has a plurality of first positioning holes, and the inner wall of the rotating drum 233 has four second positioning holes 331 evenly distributed along the circumferential direction. The control assembly includes a first positioning rod 31 that can slide along the axial direction of the cavity. The first positioning rod 31 enters the first positioning hole 311 to position the sliding platform 23. The first positioning rod 31 cooperates with the first positioning holes 311 at different positions to position the sliding platform 23 at different positions on the slide rail 24. The control assembly also includes a positioning column 33 that passes through the side wall of the bearing shaft 232 and can slide radially along the bearing shaft 232. The positioning column 33 enters the second positioning hole 331 to position the rotating drum 233. As shown in the attached figure Figure 4 As shown, at this time, the sliding platform 23 is in a lifting state, that is, the first positioning rod 31 is in a matching state with the first positioning hole 311, the sliding platform 23 is in a fixed state relative to the slide rail 24, and the rotating drum 233 is in a rotating state relative to the bearing shaft 232. During the rotation of the rotating drum 233, the second positioning hole 331 is periodically aligned with the positioning column 33, and the attached Figure 4 What is presented is the state that the second positioning hole 331 and the positioning column 33 are not aligned (misaligned). Figure 8 As shown, the sliding platform 23 is in a transverse state at this time, that is, the second positioning hole 331 is aligned with the positioning column 33 and the positioning column 33 enters the second positioning hole 331 , while the first positioning rod 31 is out of the first positioning hole 311 .

[0037] As attached Figure 4 , Attachment Figure 5 As shown, a tension spring 1391 is sleeved on the first positioning rod 31 so that the first positioning rod is pushed toward the first positioning hole 311. A piston 132 is arranged at the right end of the first positioning rod 31. The two sides of the piston 132 are respectively the first oil chamber 39 where the first positioning rod 31 is located and the second oil chamber 38 where the positioning column 33 is located. The side wall of the first oil chamber 39 is provided with two threaded holes, one of which is used to connect the oil inlet nozzle 43 to pressurize the hydraulic oil into the first oil chamber 39, and the other threaded hole is used to thread the second positioning stud 42. The second positioning stud 42 is screwed into the first oil chamber 39 to limit the piston 132 to limit the stroke of the first positioning rod 31. Secondly, as shown in the attached Figure 5 As shown, the tension spring 1391 should be in a tensioned state, and both ends of the tension spring 1391 need to be fixed. Therefore, a collar 44 is welded on the end of the tension spring 1391 facing the piston 132, and a limiting hole is provided on the collar 44. The end of the first positioning rod 31 facing the piston 132 is provided with a threaded hole. The collar 44 can be positioned on the first positioning rod 31 by inserting a stud into the limiting hole and screwing the stud into the threaded hole. Figure 4 As shown, a sealing cover 35 is threadedly connected to the left side of the cavity, the first positioning rod 31 passes through the sealing cover 35 and forms a sealing connection, the other end of the tension spring I391 is welded to the sealing cover 35, or a gasket is provided under the sealing cover 35, the gasket can be tightened by tightening the thread, and the tension spring I391 is welded to the gasket.

[0038] A tension spring II341 is provided below the positioning column 33 to pull the positioning column 33 away from the second positioning hole 331. A positioning seat 34 is provided below the positioning column 33. The positioning seat 34 is threadedly connected to the side wall of the second oil chamber 38. The positioning seat 34 is provided with a blind hole that matches the end of the positioning column 33 to further limit the positioning column 33. Figure 6 As shown, the front end of the positioning column 33 (i.e., the end that matches the second positioning hole 331) and the end form a step shape, and a ring groove is provided on the step surface. One end of the tension spring II341 is inserted into the ring groove to be fixed to the positioning column 33. The fixing method is the same as that of the tension spring I391. The other end of the tension spring II341 is welded to the positioning seat 34. A positioning surface is set on the positioning seat 34. The positioning surface and the outer side surface of the front end of the positioning column 33 are also stepped surfaces; as shown in the attached Figure 7 As described above, the piston 132 contacts the outer side surface of the front end of the positioning column 33, and the first positioning rod 31 is still matched with the first positioning hole. Figure 8As shown, the piston 132 contacts the positioning surface of the positioning seat 34, and the first positioning rod 31 is disengaged from the first positioning hole.

[0039] A buffer chamber 37 is provided at the right end of the second oil chamber 38, a piston II36 and a compression spring abutting against the piston II36 are provided in the buffer chamber 37, a positioning screw 41 is provided in the second oil chamber 38, and the compression spring presses the piston II36 toward the positioning screw 41 to limit the travel of the piston II36 toward the second oil chamber 38. The buffer chamber 37 is connected to the outside and is in a normal pressure state. In this embodiment, the control components are provided at both ends of the load-bearing shaft 232, that is, the control components at both ends are symmetrically provided.

[0040] As attached Figure 4 As shown, when in the lifting state, the first oil chamber 39 is pressurized (the pressurizing device can be a hydraulic pump, which is installed above the sliding platform 23), so that the control component presents the following Figure 7 In the state shown in the figure, the sliding platform 23 is in the intermediate state of switching from the lifting state to the lateral state. Although the piston I32 moves toward the second oil chamber 38 and contacts the outer side of the front end of the positioning column 33, and the piston II36 moves to the right, so that the pressure of the second oil chamber 38 is also increased, the second positioning hole 331 is not aligned with the positioning column 33; with the continuous application of tension by the cable, the drum 233 rotates, and the control component presents the following Figure 8 In the state shown, the positioning column 33 is aligned with the second positioning hole 331; under the pressure of the second oil chamber 38, the positioning column 33 enters the second positioning hole 331, and under the continuous pressurization of the first oil chamber 39, the piston I32 continues to move forward and contacts the positioning surface of the positioning seat 34, then the first positioning rod 31 disengages from the first positioning hole 311, completing the switching from the lifting state to the lateral displacement state.

[0041] When in the transverse state, the pressure in the first oil chamber 39 is released, and the cable continuously applies tension, so that the first positioning rod 31 will be aligned with one of the first positioning holes 311, and the tension spring I391 will push the first positioning rod 31 toward the first positioning hole 311; and the piston II36 is limited by the positioning screw 41, the pressure in the second oil chamber 38 is reduced, and the tension spring II341 pulls the positioning column 33 out of the second positioning hole 331, completing the switching from the transverse state to the lifting state.

[0042] Embodiment 2:

[0043] The difference between the second embodiment and the first embodiment is that the traction system 22 in the second embodiment is composed of a first winch and a second winch. The first winch is fixedly installed at the top of the side of the gantry 21 facing the side span, and the second winch is fixedly installed at the bottom of the main tower near the anchor. The cable of the traction system 22 starts from the second winch and is wound on the winches of the first winch and the second winch respectively, and the power is provided by the first winch and the second winch working at the same time. That is, the starting end of the cable of the traction system 22 is wound on the winch of the second winch, and then pulled to the first winch and wound on its winch, and finally wound on the drum 233; the first winch and the second winch work synchronously, and the power is transmitted to the cable to form a superposition, and finally the saddle is lifted.

[0044] The above is only an embodiment of the present invention, and the common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which should also be regarded as the protection scope of the present invention, and these will not affect the effect of the implementation of the present invention and the practicality of the patent.

Claims

1. A lifting device for a suspension bridge saddle, characterized in that: The hoisting equipment includes a gantry installed on the top of the main tower. The gantry adopts a truss structure. A cable saddle introduction port is reserved on the gantry toward the middle span. Parallel slide rails are set on the top of the left and right sides of the gantry along the direction of the bridge. A traction system is installed on the gantry toward the side span. The traction system is a winch. A sliding platform is installed on the slide rail, and the sliding platform is slidably connected to the slide rail. A load-bearing shaft is fixed on the front side of the sliding platform, and a rotatable drum is arranged outside the load-bearing shaft. The cable of the traction system is wound around the drum. A cavity is provided in the bearing shaft, in which a control assembly is installed, a plurality of first positioning holes are provided on the side wall of the slide rail, and a plurality of second positioning holes are evenly distributed on the inner wall of the rotating drum along the circumferential direction; the control assembly includes a first positioning rod that can slide along the axial direction of the cavity, and the first positioning rod enters the first positioning hole to position the sliding platform; the control assembly also includes a positioning column that penetrates the side wall of the bearing shaft and can slide radially along the bearing shaft, and the positioning column enters the second positioning hole to position the rotating drum; A tension spring I is sleeved on the first positioning rod so that the first positioning rod is pushed toward the first positioning hole. A piston I is arranged at one end of the first positioning rod away from the first positioning hole. The two sides of the piston I are respectively the first oil chamber where the first positioning rod is located and the second oil chamber where the positioning column is located. When the first oil chamber is pressurized, the piston I moves toward the second oil chamber, the first positioning rod is separated from the first positioning hole, and the second oil chamber pushes the positioning column into the second positioning hole, thereby switching the positioning state of the sliding platform to the rotating drum positioning state. A tension spring II is arranged under the positioning column so that the positioning column is subjected to a force that pulls it away from the second positioning hole, and the pressure of the first oil chamber is relieved. The tension spring I pushes the first positioning rod toward the first positioning hole, and the pressure of the second oil chamber is reduced. The tension spring II pulls the positioning column out of the second positioning hole, and the positioning state of the rotating drum is switched to the positioning state of the sliding platform. A buffer chamber is provided on the side of the second oil chamber away from the first oil chamber, a piston II and a compression spring abutting against the piston II are provided in the buffer chamber, a positioning screw is provided in the second oil chamber, and the compression spring presses the piston II toward the positioning screw; a positioning seat is provided below the positioning column, the positioning seat is threadedly connected to the side wall of the load-bearing shaft, a positioning surface is provided on the positioning seat, and the positioning surface forms a stepped surface with the outer side surface of the positioning column; The piston 1 contacts the outer side surface of the positioning column, the first positioning rod is still matched with the first positioning hole, the piston 1 contacts the positioning surface of the positioning seat, and the first positioning rod is disengaged from the first positioning hole.

2. The lifting device for a suspension bridge saddle according to claim 1, characterized in that: The slide rail is in an inclined state with a higher end, and the inclination angle is 5-8°.

3. The lifting device for suspension bridge saddle according to claim 2, characterized in that: The buffer chamber is maintained at normal pressure.

4. The lifting device for suspension bridge saddle according to claim 3, characterized in that: The winch is fixedly mounted on the top of the portal frame at the end facing the side span side.

5. The lifting device for suspension bridge saddle according to claim 4, characterized in that: The traction system includes a first winch fixed at the end of the gantry top facing the side span side and a second winch fixedly installed at the bottom of the main tower. The first winch and the second winch are connected in series to jointly provide driving force.

Images